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Results tagged with vector-layer
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user 638
A vector layer represents geographic data whose features are given by sequences of points. (Contrast with a raster, which is a grid of values.)
1
vote
Accepted
Linear referencing using virtual layers in QGIS
This answer is not a complete answer as I don't have the same exact environment. You need to cast to get the "right result". The content should be more or less like the following
SELECT id /*:int*/, S …
- 31.2k
1
vote
OpenLayers Interaction - events are returning wrong features
You can use a third party library like JSTS to solve your issue.
You can find out how to select exactly by polygon instead of extend by looking at this sample
- 31.2k
1
vote
Exporting two vectors layer as one image
In the original code, iface.addMapLayers does not exist not anywhere in the doc e.g https://qgis.org/api/classQgisInterface.html. So, simply remove it.
Because of the previous remark, settings.setLaye …
- 31.2k
2
votes
Accepted
Add layer to QGIS 3 map from processing script
From a previous answer in another processing context, the following should do what you want
context.temporaryLayerStore().addMapLayer(layer)
context.addLayerToLoadOnCompletion(
layer.id(), …
- 31.2k
1
vote
Accepted
Openlayers 4 WFS & vector select
You will find 2 solutions:
one using EPSG 27700 for map (hence the OpenStreetMap cutting on the OSM basemap)
the other one using EPSG 3857 for map (slower as a reprojection client side happened)
N …
- 31.2k
0
votes
Add a vector GeoJSON layer in OpenLayers 5.1.3
Normally, you don't need to set an option like featureProjection: 'EPSG:3857' in new ol.format.GeoJSON call. Why? Because by default, any GeoJSON should be using coordinates with EPSG:4326 (lon/lat fo …
- 31.2k
2
votes
Accepted
QGIS action loading layer in GPKG
You can find below solution to do the job
The full code is the following
from qgis.core import (
QgsVectorLayer
)
# Change to your own GPKG path
path_to_gpkg = "path/to/your/own.gpkg"
# Replace [% …
- 31.2k
2
votes
Connecting QGIS to OS Vector Tile API
Already consumed Ordnance Survey vector tiles but from Zoomstack product using Maptiler plugin https://twitter.com/ThomasG77/status/1276092119770378240 except there are not key for access contrary to …
- 31.2k
8
votes
Accepted
Exporting Vector layer using PyQGIS
The official doc for QgsVectorFileWriter.FieldValueConverter tells you that it's an "Interface to convert raw field values to their user-friendly value"
The interface has 3 methods, clone, convert and …
- 31.2k
4
votes
Accepted
Use LonLat coordinates to perform queries on API
You need to make an Ajax call using fetch (it could also be the "old" XMLHttpRequest, more a question of preferences)
The relevant code you need to change is the following
map.on('singleclick', func …
- 31.2k
3
votes
Accepted
Changing symbol and color of vector Layer using QGIS 3 C++ APIs
A Python correction to get your issues (moreover, was too long to get a minimum C++ project to debug ;) )
layer = iface.activeLayer()
layerRenderer= layer.renderer()
mSingleRenderer = QgsSingleSymbol …
- 31.2k
1
vote
Accepted
Rendering CSV file as annotation on QgsMapCanvas
You issue is elsewhere. You do not load all providers and in this case delimitedtext
Because provider is not available, your code always fails.
You need to declare something like that at the beginning …
- 31.2k
7
votes
Accepted
Create a shapefile from geometry with OGR
You need to create a feature an add the feature (a feature = a geometry + fields) to the layer
import sys
from osgeo import ogr
from osgeo import osr
# Creating a line geometry
linegeo = ogr.Geometr …
- 31.2k